Make billing information mandatory for paid orders

[abhinavk96]

[kushthedude]

@CosmicCoder96 Wont this be handled in FE Validations ?

[iamareebjamal]

@kushthedude Handling anything on frontend is equivalent to handing a blank cheque with your signature to a thief and hoping he won't cash it. Seems like you missed my message a month back in the gitter channel about frontend validations === useless validations